Multicolor printing



" 5'0 plate, results in a print UNITED s BERT C. CHAMBERS,

YORK, AND GEORGE S.

' JEAN ears 1110., or new R'o Drawing. Applica T rEs PATENT OFF-ICE.

OF DOBBS FERRY, AND JOHN PIKNIERIM, 0]! BROOKLYN, NEW

MESSING, 01? EAST ORANGE, NEW JERSEY, ASSIGNORS TO YORK, n.1,

'A CORPORATION OF NEW YORK.

mun'rIcoLon rnm'rrne.

tlon med December 30,1925. swam. 78,376.

Our invention relates to processes for printing in a process forproducing which have the appearance,

colors and more particularly to colored prints the brilliancy andtransparency of color of a water color It is an object painting.

this

to provide a process of adapted for use upon' now in use. Thedevelopment from the beginning development of have generally ingmaterials, used have been adapted to plates of this character.

plate making.- bee-n made of hard, unyieldsuch as metal, and the inksofour invention nature which is the printing presses ofcolor printing hasbeen dependent on the The plates.

the use of the Present processes of color printing are consequentlyperformed with inks which are of a very impure and often opaque'color.The inks commonly used consist of a pigment or a dye to which variousforeign materials have been added, such hydrate.

dryer, and aluminum as varnish, These foreign materials are I added tothe coloring agent for the purpose of sufficient body and tack a rollerand to roller to a plate in The pure color an even giving the ink to becarried by be transferred from the film.

without the addition of these foreign materials cannot be satisfactorilycarried by such rollers,

from such rollers to such such plates to the paper.

It will be evident that the or transferred plates, or from requirementsof the material of which the plate is composed and material of which theroller is composed,

governs the nature of the ink which must be used in the presentprocesses and these requirements result in the production of a muddy or,dead color inthe finished print because of the addition of thesedeleterious substances to the ink.

In this art it has, therefore. always been a difficult matter to producea arent and pure color onaddition of the body giving materials,

clear, trans- The above the sheet.

mentioned, although performing a useful "function in making it possibleto carry the ink on the rollers and quality of its color.

to transfer it tothe which suffers in the have departed from thepreviouspractice in the art in that we employ a coloring agent which issubstantially pure and we avoid the necessity rubber and colors.

heavy body or it may finished print having of adding to this coloringagent any deleterious foreign substances. The instrumentalities we usefor carrying out our process are adapted to the nature of such coloringagents. For example, we utilize rollers and plates of. materials thatwill carry our It will thus be seen that our process is the reverse ofthat at present 'in use. In other words, we select materials for ourrollers and plates which will carry our ink rather than selecting an inkwhich will be carried by the rollers and plates. Such a coloring agentcomprises a pigmentor dye in a hygroscopic carrier such as, for example,glycerine. The pigment or dye might be mixed with water or alcohol, wereit not for the rapid drying qualities of these carriers which-are likelyto dry on -.the'rollcm or plates beforethe colors can be transthis orsimilar character we refer to hereinafter as a watery ink or asan ink ofthe water color type. It will thus be. seen that the ink or coloringagent used by us is an. almost pure color when fed to the rollers andwhen the same paper to, which transferred there is little trace ofanything except pure color.

- Such an ink may be made with a. very according to the quantity ofliquid carrier used in the mixture. In either case it may be used in ourprocess and -will yield a hereinabove described. Such an ink w1ll not,however, possess suflicient tack to function properly with plates androllers ordinarily used.

We have found, however. that a roller composed of a resilient materialsuch as a plate of the same or similar .ferred to the paper. We prefer,therefore, 1

has dried on the the impression has. been I be made very fluid,

the desirable qualities resilient material will hold the ink evenly Qand transfer the impression accurately to the paper. The plate, in fact,may consist of a wood block having a facing of heavy rubber sheet uponwhich the design may be out either in relief or intaglio. The re-.

siliency of the plate is an important element in our invention and theeffect obtained by its use may be furthered by the use of a somewhatyielding'material in the packing of the press upon which the sheet to beprinted is held while the impression from the plate is being made. Sheetrubber may thus be used in the packing.

The instrumentalities used in our process, therefore, comprise an ink orcoloring agent which is substantially pure; a roller of a materialadapted to carry such an ink and transfer the same evenly to a plate;and a late and packing of a resilient material. eparate plates, are usedfor each color to be comprised in the print, as 1n the case in presentprocesses.

Having thus described our invention what we claim is:

1. The process of color printing which comprises the inking of a reliefplate of resilient material with an ink of the water color type andtransferring an impression therefrom.

2. The process of color printing which comprises the inking of a reliefplate of resilient material with an ink consisting of a coloring agentin a fluid adapted to carry said coloring agent without substantialmodification of the color thereof andtransferring an impression fromsaid plate to paper.

' 3. The process of color printing which comprises the application of afilm of an ink of the water colorltype to a printing form composed ofresilient material and pressing said printing form against the sheet tobe printed while the said sheet is resiliently held.

4. The process of color rinting which comprises the application 0 a filmof nonoleaginous coloring agent to a printing form of resilient materialand pressln said plate against the sheet to be printe while the saidsheet is resiliently held. A

5. The process of color rinting which comprises the application of avarnish free ink to a printing form of resilient material and pressingsaid printing the sheet to be printed while resiliently held.

6. A process .of color printing which comprises the making of animpression from a relief printing form composed of resilient materialcarryinga film of ink consisting said sheet is form aigainst of acoloring agent in a hygroscopic carrier.

7. A process of color printing which comprises the making of animpression from a relief printing form of resilient material with inkconsisting of a coloring agent and glycerine without the addition of anyother body giving material.

8. A process of color printing comprising the inking of a relief plateof resilient material with an ink consisting of a coloring agent, in ahighly fluid carrier.-

9. The step in said process of color printing which consists in printingfrom a rubber plate with an ink of the water color type.

10. The processof color printing which comprises the inking with aliquid ink of a plate composed of resilient material suitably formedinto the design to be printed, the edges of said resilient materialforming the design being unconfined, and making an BERT C. CHAMBERS.JOHN P. KNIERIM. GEORGE S. MESSING.

